abstract class A3{
	abstract void callme();
	void callmetoo(){
		System.out.println("this is a concrete class");
	}
}
class B3 extends A3{
	void callme(){
		System.out.println("This method refers to abstract method of A3");
	}
}
public class AbstractSample {
	public static void main(String[] args){
		B3 b = new B3();
		b.callme();
		b.callmetoo();
	}
}
